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Carretero, C. and Vazdekis, A. and Beckman, J. E. and Sánchez Blázquez, P. and Gorgas García, Francisco Javier (2004) On the environmental dependence of the cluster galaxy assembly timescale. Astrophysical journal, 609 (2). L45-L48. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1086/422749
Abstract
We present estimates of CN and Mg overabundances with respect to Fe for early-type galaxies in eight clusters over a range of richness and morphology. Spectra were taken from the Sloan Digital Sky Survey Data Release 1 and from William Hershel Telescope and Centro Astronómico Hispano-Alemán observations. Abundances were derived from absorption lines and single-burst population models, by comparing galaxy spectra with appropriately broadened synthetic model spectra. We detect correlations between the [Mg/CN] and [CN/Fe] values and the cluster X-ray luminosity. No correlation is observed for [Mg/Fe]. We also see a clear trend in the richness and morphology of the clusters. This is interpreted as giving varying formation timescales for CN, Mg, and Fe and a varying star formation history in early-type galaxies as a function of their environment: intermediate-mass early-type galaxies in more massive clusters are assembled on shorter timescales than in less massive clusters, with an upper limit of ~1 Gyr.
Item Type: | Article |
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Additional Information: | © 2004. The American Astronomical Society. All rights reserved. |
Uncontrolled Keywords: | Color-magnitude diagram; Digital sky survey; Population synthesis; Elliptic galaxies; Distant clusters; Feature indexes; Evolution; Sample; Stars; Abundances |
Subjects: | Sciences > Physics > Astrophysics Sciences > Physics > Astronomy |
ID Code: | 36914 |
Deposited On: | 13 Apr 2016 15:04 |
Last Modified: | 10 Dec 2018 15:05 |
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